Beattie
New Member
- Posts
- 1
- Location
- Worcestershire
My first post is a question about boost mods to my 110 300Tdi. I hope its in the correct area & not already been covered a million times!
After considerable research in manuals & on forums I decided I want to install an EGT gauge, oil pressure & oil temp gauges & a tacho. Whilst waiting for these to arrive I have installed a boost gauge running from the inlet manifold & run about on this alone for a week or so. Preferring not to alter the wastegate actuator, today I installed a Turbo Smart style boost controller (ebay version MBC). Its not a bleed type but a spring loaded ball (blow off type). It is set to minimum to avoid running lean. When the EGT gauge is fitted and I am confident enough, I may adjust the injection pump and increase the boost.
After fitting the MBC I noticed an immediate albeit slight increase in response to my right foot.
Boost seems to be building quicker according to the gauge but still not getting above the usual 0.8/0.9 bar, which suits me at present. I am under the impression that by staying below 14.7psi, the wastegate is no longer opening and the increased responsiveness is due to increased boost gained by reducing or illuminating the wastegate creeping open as I approach 1 bar. (Feel free to correct me if I am wrong).
Water temperature is reading the normal half way mark on the gauge, but the cab seems to be a little warmer than usual. This may be due to the ambient temperature rising recently or the ducting falling into place (havent checked).
Emissions during MOT this month were 0.9 (a lot less than the failure threshold of 3). I intend to get them checked again in about a week to see if they have dropped.
My question is, although I am not exceeding the normal boost pressure, if I am, as I appear to be, getting more boost before the wastegate opens, is my injection pump still delivering sufficient fuel to keep the original fuel/air ratio, or am I running lean briefly every time I accelerate?
I think that as the boost increases the diaphragm should be responding to increase fuel (up to a point) so even without adjusting the pump, it should still be right at present. I just find it difficult to believe I am getting all this extra response for nothing (ex cost of parts).
Comments welcome & appreciated.
After considerable research in manuals & on forums I decided I want to install an EGT gauge, oil pressure & oil temp gauges & a tacho. Whilst waiting for these to arrive I have installed a boost gauge running from the inlet manifold & run about on this alone for a week or so. Preferring not to alter the wastegate actuator, today I installed a Turbo Smart style boost controller (ebay version MBC). Its not a bleed type but a spring loaded ball (blow off type). It is set to minimum to avoid running lean. When the EGT gauge is fitted and I am confident enough, I may adjust the injection pump and increase the boost.
After fitting the MBC I noticed an immediate albeit slight increase in response to my right foot.
Boost seems to be building quicker according to the gauge but still not getting above the usual 0.8/0.9 bar, which suits me at present. I am under the impression that by staying below 14.7psi, the wastegate is no longer opening and the increased responsiveness is due to increased boost gained by reducing or illuminating the wastegate creeping open as I approach 1 bar. (Feel free to correct me if I am wrong).
Water temperature is reading the normal half way mark on the gauge, but the cab seems to be a little warmer than usual. This may be due to the ambient temperature rising recently or the ducting falling into place (havent checked).
Emissions during MOT this month were 0.9 (a lot less than the failure threshold of 3). I intend to get them checked again in about a week to see if they have dropped.
My question is, although I am not exceeding the normal boost pressure, if I am, as I appear to be, getting more boost before the wastegate opens, is my injection pump still delivering sufficient fuel to keep the original fuel/air ratio, or am I running lean briefly every time I accelerate?
I think that as the boost increases the diaphragm should be responding to increase fuel (up to a point) so even without adjusting the pump, it should still be right at present. I just find it difficult to believe I am getting all this extra response for nothing (ex cost of parts).
Comments welcome & appreciated.
